CN204855992U - Liquid crystal display module and liquid crystal disply device - Google Patents
Liquid crystal display module and liquid crystal disply device Download PDFInfo
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- CN204855992U CN204855992U CN201420873316.7U CN201420873316U CN204855992U CN 204855992 U CN204855992 U CN 204855992U CN 201420873316 U CN201420873316 U CN 201420873316U CN 204855992 U CN204855992 U CN 204855992U
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Abstract
The utility model provides a liquid crystal display module and liquid crystal disply device, liquid crystal display module includes illuminating part, light guide plate and display screen, liquid crystal display module follows the light guide plate arrives the direction of display screen has been laid down in proper order and has been spread piece, light collecting part and spread the piece on and, spread down have at least among piece and the last diffusion piece one for the PDLC film, each PDLC film is including the first electrode layer and the second electrode lay that are used for receiving drive signal to including a polymer liquid crystal layer, polymer liquid crystal locates on the layer between first electrode layer and the second electrode lay. This application can realize the brightness enhancing additionally not increasing under the condition of the consumption of being shaded, and simultaneous display visual angle and luminance are adjustable. This application can also improve the controllable degree at the luminance of liquid crystal display module emergent light and light type, visual angle effectively.
Description
Technical field
The utility model relates to a kind of liquid crystal display module and liquid crystal indicator.
Background technology
Traditional cathode-ray tube (CRT) (CRT) display gradually substitute by flat panel displays such as liquid crystal display, OLED (Organic Light Emitting Diode) displays.And along with the continuous progress of semiconductor technology, lcd technology, people live improving constantly of taste, current large scale, ultra-thin, wide viewing angle, high colour gamut, high brightness flat pannel display become development trend.Particularly for outdoor application products such as outdoor advertisement machine and mobile phone, panel computer, GPS (GPS) hand-held mobile terminals, it is necessary for possessing high brightness to meet readability under sunlight.
Because liquid crystal panel itself is not luminous, backlight is needed to provide light source just can reach display effect.Backlight mode can be divided into straight-down negative and side-light type two kinds according to the position of light source.Straight-down negative needs certain light mixing distance, and structure is thicker, for realizing slimming, now adopts side-light type more.The light source that light source was commonly used in the past is cold-cathode fluorescence lamp (CCFL) backlight, but it has a series of shortcoming gradually by light emitting diode (LED) backlight is replaced.LED backlight has lot of advantages: structure of whole solid state, and physical strength is good; Colored expressive ability is strong; Without mercury light source, environmental protection; Low-voltage direct-current drives (3-5V), eliminates the high voltagehigh frequency driving circuit of cold-cathode lamp, decreases electromagnetic radiation; Life-span is long, can reach more than 60,000 hours etc.The mainstream technology of the slimming liquid crystal display module backlight of current extensive application adopts side light type LED back light module.
No matter be which kind of light source (CCFL or LED), which kind of backlight mode (straight-down negative or side-light type), the backlight module of prior art all needs first light source to be converted to area source.If the conversion regime of direct-light-type backlight is collocation diffuser plate, if side-light type back light, then the photoconduction that the lamp bar of incident sideways is launched is uniform area source by light guide plate by light guide plate of arranging in pairs or groups.And then by prismatic lens optically focused, the even light of diffusion sheet, is incident to liquid crystal panel.
The liquid crystal display module structure of prior art as shown in Figure 1.For side-light type LED light source in Fig. 1, reflection diaphragm group is in standard three diaphragm structures (lower diffusion sheet+prismatic lens+upper diffusion sheet) figure 11 be LED lamp bar, 111 is LED, 112 is PCB (printed circuit board) plate of LED lamp bar, 12 is light guide plate, its lower surface is furnished with site, LED lamp bar can be sent light and transfer uniform area source to; 13 is lower diffusion sheet, and its effect is the light uniformity coefficient promoting light guide plate outgoing, (the mist degree >90%) of normally haze; 14 is prismatic lens, and it act as the light of light guide plate outgoing as far as possible towards vertical prism sheets direction light harvesting; 15 is upper diffusion sheet, and its effect is that the light of prismatic lens outgoing is again even, strengthens the uniformity coefficient of area source further; 16 is LCDs (LiguidCrystalDisplay, LCD).
The liquid crystal display module of prior art increases the method for brightness, and be generally and directly increase back light source brightness, the method can increase backlight power consumption and heating, be unfavorable for the cruising time keeping mobile device especially, and visible angle is unadjustable.
Utility model content
The technical problems to be solved in the utility model is the defect that cannot regulate to overcome the higher and visible angle of energy consumption when liquid crystal display module in prior art increases brightness, provides a kind of energy consumption less and display view angle and brightness can the liquid crystal display module of flexible and liquid crystal indicators.
The utility model solves above-mentioned technical matters by following technical proposals: a kind of liquid crystal display module, described liquid crystal display module comprises illuminating part, light guide plate and display screen, its feature is, described liquid crystal display module is equipped with lower diffusion sheet successively along described light guide plate to the direction of described display screen, light collecting part and upper diffusion sheet, one is had at least for Polymer Dispersed Liquid Crystal (Polymerdispersedliquidcrystals among lower diffusion sheet and upper diffusion sheet, be called for short PDLC) film, each PDLC film comprises the first electrode layer for receiving drive singal and the second electrode lay, and comprise a polymerised liquid crystal layer, described polymerised liquid crystal layer is located between described first electrode layer and the second electrode lay.
The utility model adopts PDLC film to realize visual angle and the adjustable liquid crystal display module of brightness.Polymer dispersed liquid-crystal film is a kind of Liquid Crystal/Polymer compound electric luminescent material.PDLC film nematic droplets is dispersed in the optical thin film formed in polymeric matrix.PDLC film is a kind of novel liquid crystal functional material, has good electro-optical characteristic, comprises lower threshold voltage and saturation voltage, faster response time and higher contrast, is conveniently made into the film of various thickness.When not applying electric field, in PDLC film, random alignment is lost in the sensing of liquid crystal droplet, because the ordinary refraction index (no) of light by liquid crystal droplet does not mate with the refractive index (np) by polymeric matrix, there is multiple reflections and refraction in light, PDLC film is opaque state on liquid crystal and polymer interface; When applying electric field along the normal orientation of PDLC film, the sensing of liquid crystal droplet is lost along electric field orientation, if select the ordinary refraction index of liquid crystal (no) to match with the refractive index (np) of polymkeric substance, reflection is there is not and reflects and directly transmit, the transparent state of PDLC film in light in film.After electric field is closed, the sensing of the liquid crystal molecule in PDLC film in liquid crystal droplet lose with the effect of macromolecule network anchoring energy under reply and point at random, PDLC film becomes again opaque state.
The utility model utilizes this characteristic of PDLC film, uses the diffusion sheet of its alternative prior art, and reach the object regulating transmitted light brightness and light type (change visual angle), the possibility that PDLC film is used for doing diffusion sheet substitute is considered based on following:
Light transmission: PDLC film light transmission is relevant with the polymer liquid crystal material that it adopts, different its light transmissions of polymer liquid crystal material is adopted to have difference, usual PDLC film visible light transmissivity in the clear state can reach about 80%, even if the daylighting of PDLC film is still fine time opaque, usually the transparency of about 30% can still be reached, and have reflector plate in backlight, actual opaque state transmittance can be made to be greater than 30%.By changing the size of driving voltage, its transparency can be adjustable arbitrarily between clear state maximum transparency and opaque state transparency.
Brightness and visible angle: brightness aspect depend primarily on backlight luminescence total light flux, enter optical efficiency, the absorption loss of PDLC film itself and transmitance.The good PDLC film of current preparation, light loss rate has dropped to less than less than 20%, close to the transmittance of usual diffusion sheet.Visible angle can reach more than 165 °.Add the transmitance of glazing and outgoing light type and visual angle artificially to be regulated by voltage, as long as so the luminous flux of LED is enough, brightness and visual angle just can regulate as required.
Slewing rate: PDLC film slewing rate is fast, generally only needs several to dozens of ms can complete clear state and opaque state switches.
Preparation: be easy to be made into large area.Conventional preparation method has photic method and thermic method.Use the materials such as palycyclic aromatic, condensed-nuclei aromatics, ring polyenoid, add light trigger, formed by ultraviolet light polymerization.Also, after can using liquid crystal and the mixing of poly-NMF (PMMA) solution, uniform application, on ITO (electro-conductive glass) glass, is formed after PDLC film carries out heat curing and is formed between two-layer ito glass.
Spectrum and colour temperature: whole visible spectrum is all positioned at the low loss window of PDLC film, and transmission spectrum is very smooth at visible-range.Be applicable to very much transmission visible ray.Simultaneously because PDLC film transmitted spectrum is more smooth in visible region, the colour temperature of backlight emergent light after the transmission of PDLC film is also able to good maintenance.
Based on above consideration, PDLC film is suitable for the substitute doing diffusion sheet.Especially when needing transmittance and the adjustable situation of visible angle, arrange in pairs or groups multiple prismatic lenses or composite membrane can promote high-high brightness, readable under strengthening outdoors sunlight.
Liquid crystal display module of the present utility model can adopt CCFL that LED also can be adopted as the light source of illuminating part, can adopt the light source arrangement mode of straight-down negative, also can adopt the light source arrangement mode of side-light type.For side-light type LED light source, the lower surface of light guide plate can be provided with site, can transfer the light that LED lamp bar sends to uniform area source; Diffusion sheet for promoting the light uniformity coefficient of light guide plate outgoing, (the mist degree >90%) of normally haze; Light collecting part can be prismatic lens, can adopt 1 or 2 prismatic lenses as required, and it act as the light of light guide plate outgoing as far as possible towards vertical prism sheets direction light harvesting.Usually 1 prismatic lens is used to the liquid crystal display module of the higher large scale used as television of visual requirement, and the liquid crystal display module of hand-held product many uses employing 2 prismatic lenses of the single use such as small size, the lenticule film of class prismatic lens function or composite membrane also can be selected to substitute prismatic lens; Utilize existing control method PDLC film can control light quantity and the angle of prismatic lens outgoing, strengthen the uniformity coefficient of area source further.
Wherein, the electrode layer of described PDLC film can be tin indium oxide or its Res fungibiles material (including but not limited to comprise the materials such as nano-silver thread, metal grill, CNT and Graphene).
Preferably, described upper diffusion sheet is PDLC film, or upper diffusion sheet and lower diffusion sheet are PDLC film.
Preferably, described illuminating part is LED lamp bar, and described LED lamp bar comprises some LED and LED lamp drive circuit.
Preferably, the electrode layer of described PDLC film is the glass or the plastics that are coated with tin indium oxide.
Preferably, described light collecting part is a prismatic lens.
Preferably, described light collecting part comprises one first prismatic lens and one second prismatic lens, and the prism in described first prismatic lens is vertical with the prism in the second prismatic lens.
The utility model also provides a kind of liquid crystal indicator, it comprises liquid crystal display module as above, a treatment circuit and for sending the PDLC driving circuit of drive singal to described first electrode layer and the second electrode lay, described illuminating part comprises backlight and for sending the backlight drive circuit of drive singal to described backlight, described treatment circuit is provided with video interface and for described display screen transmission video signal, described treatment circuit is connected with described PDLC driving circuit and described backlight drive circuit respectively.
Processing unit has the video interface externally connected, comprise VGA (video transmission standard), DVI (digital visual interface), HDMI (HDMI (High Definition Multimedia Interface)) etc., the graphic image data being responsible for the output of process master system is flowed to display screen, utilizes existing control method control PDLC driving circuit and backlight drive circuit simultaneously.Display screen is responsible for display, and PDLC driving circuit is responsible for driving PDLC film, and backlight drive circuit is responsible for driving backlight.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains each preferred embodiments of the utility model.
Positive progressive effect of the present utility model is: the application can when additionally not increasing backlight power consumption, realize brightness and strengthen, simultaneously display view angle and brightness adjustable.The application can also improve the degree of controllability at the emergent light brightness of liquid crystal display module and light type, visual angle effectively.
Accompanying drawing explanation
Fig. 1 is the structural representation of the liquid crystal display module of prior art.
Fig. 2 is the structural representation of the liquid crystal indicator of the utility model embodiment 1.
Fig. 3 is the structural representation of the liquid crystal display module of the utility model embodiment 1.
Fig. 4 is the structural representation of the PDLC film of the utility model embodiment 1.
Fig. 5 is the structural representation of the liquid crystal display module of the utility model embodiment 2.
Embodiment
Lift preferred embodiment below, and come by reference to the accompanying drawings clearlyer intactly the utility model to be described.
Embodiment 1
See Fig. 2-4, the present embodiment provides a kind of liquid crystal indicator, it comprises a liquid crystal display module, one treatment circuit 31 and one is for sending the PDLC driving circuit 33 of drive singal to described first electrode layer and the second electrode lay, described liquid crystal display module comprises illuminating part 36, light guide plate 52 and display screen 56, described illuminating part comprises backlight 36 and for sending the backlight drive circuit 35 of drive singal to described backlight, described treatment circuit is provided with video interface and for described display screen 32 transmission video signal, described treatment circuit is connected with described PDLC driving circuit and described backlight drive circuit respectively.
Described liquid crystal display module is the liquid crystal display module of side-light type LED light source, and the LED light source of the application is not limited to yellow fluorescent powder LED, red green fluorescence powder LED, RGB (color standard) three LED of chip package.
Described liquid crystal display module is equipped with lower diffusion sheet, light collecting part and upper diffusion sheet successively along described light guide plate 52 to the direction of described display screen, described upper diffusion sheet and lower diffusion sheet are PDLC film 34, each PDLC film comprises the first electrode layer 261 for receiving drive singal and the second electrode lay 263, and comprising a polymerised liquid crystal layer 262, described polymerised liquid crystal layer is located between described first electrode layer and the second electrode lay.
This polymerised liquid crystal layer 262 is made up of liquid crystal and macromolecule polymer material.This base polymer includes but not limited to photopolymerizable compound or its potpourri, as materials such as palycyclic aromatic, condensed-nuclei aromatics, ring polyenoid.Liquid crystal material can be various liquid crystal material.
Described illuminating part is LED lamp bar 51, and described LED lamp bar comprises some LED 36 (i.e. backlight) and LED lamp drive circuit 35 (i.e. backlight drive circuit).
The electrode layer of described PDLC film is the glass (electrode layer of PDLC film also can be the plastics being coated with tin indium oxide) being coated with tin indium oxide.
Described light collecting part only comprises a prismatic lens 54.
Described display screen is the LCDs of IPS (transverse electric field effect display technique) pattern, and the display screen of the application can also be TN (twisted nematic), VA (vertical orientation technology) display screen.
Utilize existing control method, the using method of the liquid crystal indicator of the present embodiment is:
The brightness of the present embodiment LED light source is constant in the present embodiment.PDLC film can control its two-layer interelectrode voltage (preferably exchanging driving) by PDLC driving circuit 33, thus makes it switch between clear state and scattering states.PDLC driving circuit 33 can accept the steering order that treatment circuit 31 sends, and then according to steering order control PDLC film voltage.
Existing control method control PDLC film is utilized to be: the refractive index being controlled polymer liquid crystal by the electric field be carried between the first electrode layer and the second electrode lay, change the scattering strength of transmitted light, transmitance and light type, thus change brightness and the visual angle of whole liquid crystal module.Add at the first electrode layer the square wave (maximal value+V, minimum value-V volt) that peak-to-peak value is 2V volt, V can choose as required between 0-100V, and the driving voltage required for different polymer liquid crystal material is different.The second electrode lay adds constant common electric voltage (0V).When without impressed voltage, can not form regular electric field in PDLC film, the direction of optic axis of liquid crystal particle is random, in disordered state, its effective refractive index no does not mate with the refractive index np of polymkeric substance, and therefore incident ray is by strong scattering, and film is opaque or translucent.After being applied with external voltage, the optical axis of liquid crystal particle arranges perpendicular to film surface, namely consistent with direction of an electric field.The refractive index no of liquid crystal particle mates substantially with the refractive index of polymkeric substance, without sharp interface, and approximate formation uniform dielectric, so there is not scattering in incident light, the transparent shape of film.So just can be reached through voltage between controlling to be added between PDLC film upper/lower electrode layer to regulate the object of the scattering degree of transmitted light, brightness and light type.
The present embodiment can when additionally not increasing backlight power consumption, realize brightness and strengthen, simultaneously display view angle and brightness adjustable.The application can also improve the degree of controllability at the emergent light brightness of liquid crystal display module and light type, visual angle effectively.
Embodiment 2
See Fig. 5, the difference of the present embodiment and embodiment 1 is only: only going up diffusion sheet is PDLC film 46, described lower diffusion sheet is existing common diffusion sheet 43, described light collecting part comprises one first prismatic lens 44 and one second prismatic lens 45, and the prism in described first prismatic lens 44 is vertical with the prism in the second prismatic lens 45.The brightness of described LED is adjustable.Described backlight is CCFL fluorescent tube 41, and described light guide plate is Wedge shape light conduction board 42.
PDLC film type of drive is with embodiment 1.Existing control method control PDLC film is utilized to be: the refractive index being controlled polymer liquid crystal by the electric field be carried between the first electrode layer and the second electrode lay, change the scattering strength of transmitted light, transmitance and light type, thus change brightness and the visual angle of whole liquid crystal module.Add at the first electrode layer the square wave (maximal value+V, minimum value-V volt) that peak-to-peak value is 2V volt, V can choose as required between 0-100V, and the driving voltage required for different polymer liquid crystal material is different.The second electrode lay adds constant common electric voltage (0V).When without impressed voltage, can not form regular electric field in PDLC film, the direction of optic axis of liquid crystal particle is random, in disordered state, its effective refractive index no does not mate with the refractive index np of polymkeric substance, and therefore incident ray is by strong scattering, and film is opaque or translucent.After being applied with external voltage, the optical axis of liquid crystal particle arranges perpendicular to film surface, namely consistent with direction of an electric field.The refractive index no of liquid crystal particle mates substantially with the refractive index of polymkeric substance, without sharp interface, and approximate formation uniform dielectric, so there is not scattering in incident light, the transparent shape of film.So just can be reached through voltage between controlling to be added between PDLC film upper/lower electrode layer to regulate the object of the scattering degree of transmitted light, brightness and light type.
Certainly above embodiment only illustrates the utility model liquid crystal indicator specific works principle and method, and wherein the setting of brightness degree can adjust arbitrarily as required.
The present embodiment can when additionally not increasing backlight power consumption, realize brightness and strengthen, simultaneously display view angle and brightness adjustable.The application can also improve the degree of controllability at the emergent light brightness of liquid crystal display module and light type, visual angle further.
Although the foregoing describe embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present utility model and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection domain of the present utility model.
Claims (8)
1. a liquid crystal display module, described liquid crystal display module comprises illuminating part, light guide plate and display screen, it is characterized in that, described liquid crystal display module is equipped with lower diffusion sheet, light collecting part and upper diffusion sheet successively along described light guide plate to the direction of described display screen, one is had at least for PDLC film among lower diffusion sheet and upper diffusion sheet, each PDLC film comprises the first electrode layer for receiving drive singal and the second electrode lay, and comprising a polymerised liquid crystal layer, described polymerised liquid crystal layer is located between described first electrode layer and the second electrode lay.
2. liquid crystal display module as claimed in claim 1, it is characterized in that, described upper diffusion sheet is PDLC film, or upper diffusion sheet and lower diffusion sheet are PDLC film.
3. liquid crystal display module as claimed in claim 2, it is characterized in that, described illuminating part is LED lamp bar, and described LED lamp bar comprises some LED and LED lamp drive circuit.
4. liquid crystal display module as claimed in claim 2, it is characterized in that, the electrode layer of described PDLC film is tin indium oxide, nano-silver thread, metal grill, CNT or Graphene, on the glass that this electrode layer is plated in or plastic base.
5. liquid crystal display module as claimed in claim 2, it is characterized in that, described light collecting part is a prismatic lens.
6. liquid crystal display module as claimed in claim 2, it is characterized in that, described light collecting part comprises one first prismatic lens and one second prismatic lens, and the prism in described first prismatic lens is vertical with the prism in the second prismatic lens.
7. a liquid crystal indicator, it is characterized in that, it comprises as the liquid crystal display module in claim 1-6 as described in any one, one for gathering the optical inductor of ambient brightness, one treatment circuit and one is for sending the PDLC driving circuit of drive singal to described first electrode layer and the second electrode lay, described illuminating part comprises backlight and for sending the backlight drive circuit of drive singal to described backlight, described optical inductor is connected with described treatment circuit, described treatment circuit is provided with video interface and for described display screen transmission video signal, described treatment circuit is connected with described PDLC driving circuit and described backlight drive circuit respectively.
8. liquid crystal indicator as claimed in claim 7, it is characterized in that, described backlight is CCFL fluorescent tube or LED.
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| CN201420873316.7U CN204855992U (en) | 2014-12-30 | 2014-12-30 | Liquid crystal display module and liquid crystal disply device |
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| CN201420873316.7U CN204855992U (en) | 2014-12-30 | 2014-12-30 | Liquid crystal display module and liquid crystal disply device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807485A (en) * | 2014-12-30 | 2016-07-27 | 上海冠显光电科技有限公司 | Liquid crystal display module, device and control method |
| CN106297711A (en) * | 2016-09-18 | 2017-01-04 | 深圳市华星光电技术有限公司 | Display module drive circuit, driving method and display module |
| CN106847193A (en) * | 2016-12-05 | 2017-06-13 | 友达光电股份有限公司 | Display and control method thereof |
| WO2017118035A1 (en) * | 2016-01-05 | 2017-07-13 | 京东方科技集团股份有限公司 | Light guide component, backlight module and display apparatus |
| CN110412789A (en) * | 2019-07-10 | 2019-11-05 | 深圳市华星光电技术有限公司 | The regulation method of backlight module and its light transmittance |
| CN111025761A (en) * | 2019-12-30 | 2020-04-17 | 联想(北京)有限公司 | Light source device and electronic system |
| WO2020244120A1 (en) * | 2019-06-04 | 2020-12-10 | 武汉华星光电技术有限公司 | Backlight assembly, display panel assembly, and backlight control method |
| CN112712754A (en) * | 2020-12-31 | 2021-04-27 | 联想(北京)有限公司 | Display device and electronic apparatus |
| CN113075813A (en) * | 2020-11-16 | 2021-07-06 | 友达光电股份有限公司 | Display device |
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2014
- 2014-12-30 CN CN201420873316.7U patent/CN204855992U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807485A (en) * | 2014-12-30 | 2016-07-27 | 上海冠显光电科技有限公司 | Liquid crystal display module, device and control method |
| WO2017118035A1 (en) * | 2016-01-05 | 2017-07-13 | 京东方科技集团股份有限公司 | Light guide component, backlight module and display apparatus |
| US10473978B2 (en) | 2016-01-05 | 2019-11-12 | Boe Technology Group Co., Ltd. | Light guide assembly, backlight module, display device |
| CN106297711A (en) * | 2016-09-18 | 2017-01-04 | 深圳市华星光电技术有限公司 | Display module drive circuit, driving method and display module |
| CN106847193A (en) * | 2016-12-05 | 2017-06-13 | 友达光电股份有限公司 | Display and control method thereof |
| WO2020244120A1 (en) * | 2019-06-04 | 2020-12-10 | 武汉华星光电技术有限公司 | Backlight assembly, display panel assembly, and backlight control method |
| CN110412789A (en) * | 2019-07-10 | 2019-11-05 | 深圳市华星光电技术有限公司 | The regulation method of backlight module and its light transmittance |
| CN111025761A (en) * | 2019-12-30 | 2020-04-17 | 联想(北京)有限公司 | Light source device and electronic system |
| CN113075813A (en) * | 2020-11-16 | 2021-07-06 | 友达光电股份有限公司 | Display device |
| CN112712754A (en) * | 2020-12-31 | 2021-04-27 | 联想(北京)有限公司 | Display device and electronic apparatus |
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